maths

cards for maths revision

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  • Created by: alaya
  • Created on: 10-04-12 10:39

Exterior angles

Exterior angle= 360/n

Sum of exterior angles= 360


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Interior angles

Interior angle= 180- EXTERIOR ANGLE

Sum of interior angles= (n- 2)*180


2 of 6

Area of triangle

AREA of a triangle= 1/2 * base * vertical height

A= 1/2 * b * h

(http://www.mathsisfun.com/geometry/images/triangle-b-h.gif)

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area of parallelogram

AREA of a parallelogram= base * vertical height

A= b * h

(http://0.tqn.com/d/chemistry/1/0/I/f/parallelogram.gif)

4 of 6

area of trapezium

AREA of trapezium= average of parallel sided * distance between them

A= 1/2 * (a+b)* h

(http://t1.gstatic.com/images?q=tbn:ANd9GcSA_JL3wZoqJ-PUj2RWb3x0RJTT5LgE9ALO06o4urx_uKZUWiFe4PwfNQ2a)

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area of a circle

AREA of circle= pi *(radius)squared

A= pi * r squared

Circumference= C= pi * D

AREA of sector=  angle/ 360 * area of full circle

LENGTH of arc= angle/360 * circumference of full circle

(http://upload.wikimedia.org/wikipedia/commons/thumb/1/1d/CIRCLE_1.svg/220px-CIRCLE_1.svg.png)

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Comments

? Secret - Team GR

I thought the formula for circumference is 2pi * r . (first do pi times 2 then the radius) :S

alaya

nope its pi* diameter

Katie F

that's the same cos 2 of the radiuses make up the diameter. cos the diameter is all the way across the circle and the radius is halfway across. :)

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